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Old 12-10-2012, 09:16 AM   #1
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Whistling alternator?

So i started the jeep this morning and it sounds like the alternator is whining. Is it common?

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Old 12-10-2012, 09:36 AM   #2
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I know a lot of Cherokees "whistling". My buddies does it every time he starts it. And to me it sounds more like the starter. Kinda like its not disengaging like it should and when the motor cranks it spins the starter while engaged and causes the "whistle"

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Old 12-10-2012, 09:44 AM   #3
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mine does this when it is cold out. Mine sounds like it comes thru the speackers. even with the radio off it still does it but after running a few minutes it stops.
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Old 12-10-2012, 09:47 AM   #4
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Ya it stopped after about 15 mins. I did pop the hood and it definetly sounds like the alternator. It sounded supercharged!!
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Old 12-10-2012, 05:06 PM   #5
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You better check your OPDA. If the noise sounds like the "screaming monkey" it's probably that. Theres tons of stuff online regarding the OPDA failures, especially on 05 and 06 Wranglers
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Old 12-10-2012, 05:22 PM   #6
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My guess is a bad bearing in either the alternator or idler pulley which is right next to the alternator.
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Old 12-10-2012, 06:08 PM   #7
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I thought the 2002 didn't have the OPDA problem? Thanks Jerry, i'll probably replace the alternator and see if that fixes it. It didn't do it after it warmed up.
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Old 12-10-2012, 06:13 PM   #8
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Quote:
Originally Posted by baker3 View Post
I thought the 2002 didn't have the OPDA problem?
It doesn't, that's an 05/06 issue.
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Old 12-10-2012, 06:17 PM   #9
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Sweet! Glad that I don't have that issue, I have heard it is a nightmare.
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Old 12-10-2012, 08:42 PM   #10
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My old 4runner's alternator did the same thing when it dropped below 60 degrees. Always went away after it warmed up. It did that the last 7 of the 9 years I owned it.
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Old 12-10-2012, 08:51 PM   #11
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Now that I remember, my 04 F-150 did it too, hopefully it is just cause its cold out.
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Old 01-07-2014, 12:03 PM   #12
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Did you ever come up with the solution to the whistle? Mine does it but only when it's cold outside, it stops when I have my foot on the gas and comes back when I'm off the gas, and usually stops completely after the engine is warm. Any help would be appreciated!

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